Question

What is the relationship between BMR and body size? Why?

Short answer

The relations between BMR and the body size is that smaller organisms having a higher BMR, per body weight, than larger organisms.

Step-by-step solution

Step1. Introduction  

Basal metabolic rate (BMR):- metabolic rate at rest in endothermic animals.

BMR is the number of calories your body uses to maintain vital functions, such as breathing, heart rate, brain function.

Explanation 

The relation between the body size and BMR is the smaller organism the greater surface area for their mass than larger ones. so, the smaller organisms lose heat at a faster rate than the larger organisms and need more energy to maintain a constant internal temperature. This results in a smaller organisms having a higher BMR, per body weight, than larger organisms.